How often should you change the spark plugs on a 2004 jeep liberty 3.7 L?

The recommended replacement interval for spark plugs in a 2004 Jeep Liberty 3.7L is typically every 100,000 miles (160,000 km). However, it's crucial to check your owner's manual as this can vary slightly depending on your driving conditions and the type of spark plugs used. Severe driving conditions (frequent stop-and-go traffic, towing, etc.) may necessitate more frequent replacement. It's generally better to err on the side of caution and inspect them sooner, perhaps around 60,000 miles (96,000 km), to visually assess their wear. If they show significant wear, replace them.